%段落对齐
\documentclass[UTF8]{ctexart}
\title {Align the paragraph}
\author {LiChao}
\date{June 14,2012}

\begin{document}
\maketitle
\part  {Align center}
This is my first paragraph and I want to align the paragraph so that it's in the center.
\begin{center}
%如果居中段落在一行放不下，只会在最后一行是居中的，其它行都填满页面宽度。
This is my second paragraph.\\
This is my second paragraph.\\
This is also the second paragraph,but it is longer.
\end{center}

This is my last paragraph.\\
This is my last paragraph.

This is also my last paragraph,but it is longer.


\Large
Pay attention to the difference between' \textbackslash \textbackslash 'and a blank line.
\normalsize

\part {alignment in the left size}
This is my first paragraph and I want to align the paragraph so that it's in the center.
\begin{flushleft}
This is my second paragraph.\\
This is my second paragraph.\\
This is also the second paragraph,but it is longer.
\end{flushleft}

This is my last paragraph.\\
This is my last paragraph.

This is also my last paragraph,but it is longer.


\Large
Pay attention to the difference between' \textbackslash \textbackslash 'and a blank line.
\normalsize

\part {alignment in the right size}
This is my first paragraph and I want to align the paragraph so that it's in the center.
\begin{flushright}
This is my second paragraph.\\
This is my second paragraph.\\
This is also the second paragraph,but it is longer.
\end{flushright}

This is my last paragraph.\\
This is my last paragraph.

This is also my last paragraph,but it is longer.


\Large
Pay attention to the difference between' \textbackslash \textbackslash 'and a blank line.
\normalsize
\end{document}